you have to show me how you feel about it - are you pro-Palestine? Do you feel that's an unfair war? The importance of voting next week - I don't blame you for being ambivalent about that but it's still really important.

And thirdly - maybe it's time we stopped putting octogenarians in charge of the whole world?'The band mentioned that they were never expecting to have Albarn on the record or to be playing a show with him, but they just kind of asked, and he was really up for it.

'You don't ask, you don't get.

' There wasn't much time to rehearse, with about an hour to get things right for the live performance.

'But, you know, with him, that's all you need.

'Other artists rumored to potentially make surprise appearances on stages around the festival site throughout the weekend include Squeeze, K-pop act Seventeen, Olivia Dean, and The Snuts.

Bombay Bicycle Club are among the music acts kicking off the first full day of the festival, which will be headlined by Coldplay.

Squeeze opened the show early on Friday, with Joe Wicks leading a fitness session and setting his sights on taking his workouts to the Pyramid Stage.

'You don't often think about a fitness workout being at a music festival but yesterday I did a workout and about 2,000 people turned up and it was amazing,' he told Sky News, ahead of a second session on Friday.

'It's hard sleeping in a tent so if they're awake, I've said, come and join me, start the day right.

'Coldplay will headline tomorrow, while the Sunday afternoon 'legends slot' will be filled by another artist, and SZA will close the weekend.